Abstract
The catalytic application of four monoallenylidene bisphosphine Pd(II) catalysts, which were developed using alkynyl triazole salt as the allenylidene source, in the cycloisomerization of 1,6-enyne was explored. Two divergent reaction pathways, including a new type of intramolecular Alder-ene (IMAE) route and a routine cycloisomerization route, were developed using either complex TAA(Et3P)2-PdCl·BF4- 3b or TAA(Ph3P)2-PdCl·BF4- 3c as the catalyst precursor.
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